NEC LT81 - Manual (Page 18)

33
INSTALLATION 34
Desk top
Ceiling mount
C
A
Screen center
D
E
B
LT100 : 3.8” (97mm)
LT81 : 3.4” (85.6mm)
Projector feet
α
Projector feet
C
α
D
E
B
A
Unit (inch)
H (inch) = Width of screen
A = C / cos
α
B = 3.7H / 25.4
C (WIDE) = (2.026
ן
H) – 2.437
C (TELE) = C (WIDE) ן 1.3
D = E / 2
E = H / 4
ן 3
Unit (mm)
H (inch) = Width of screen
A = C / cos
α
B = 3.7H
C (WIDE) ={(2.026
ן H) – 2.437} ן 25.4
C (TELE) = C (WIDE) ן 1.3
D = E / 2
E = H / 4
ן 3
A : Distance between lens center and
screen center
B : Vertical distance between lens center
and screen bottom (screen top for ceil-
ing mount)
C : Horizontal throw distance between
screen surface and projector lens
D : Vertical distance between screen
center and screen bottom (screen top
for ceiling mount)
E : Screen Height
Screen
Screen bottom
Screen center
Screen top
LT100 : 3.8” (97mm)
LT81 : 3.4” (85.6mm)